![Subaru DiY | ‘Reverse' Coolant Mod Compare and Install [GDT Kit vs. VEMS Kit]](https://i.ytimg.com/vi/X0medlTwt8M/hqdefault.jpg "Subaru DiY | ‘Reverse' Coolant Mod Compare and Install [GDT Kit vs. VEMS Kit]")
🔹 Shop | https://www.Amazon.com/shop/SubaruONLY
Help me create MORE SUBARU CONTENT! Please consider supporting this channel by using the AMAZON LINK above to purchase parts, tools, and other automotive products!
This Subaru DiY video is the FOURTH in a multi-part series about COOLANT FLOW through the subaru EJ-SERIES engines and why you may want to consider purchasing a ‘REVERSE COOLING MOD’ kit for your Subaru. In this video, I present a side-by-side comparison of two popular ‘reverse’ cooling modification kits that are currently on the market, the Get-A-Dom-Tune (GDT) Kit versus the VEMS Tuning Kit, and I walk through the installation of the GDT Kit on my engine.
This series took a significant amount of effort to create and I think it’s one of the most comprehensive dives into Subaru cooling, the ‘reverse’ mod, and one of the achilles-heals of Subaru engines – the NUMBER FOUR CYLINDER!
This EJ-205 engine build is from a 2005 WRX and is being installed in my rally blue 1998 2.5RS coupe (aka ‘R-STi’ swap) – follow this awesome build by subscribing and watching the weekly DiY Subaru videos documenting every step! Then, get ready to do some racing!
Hope you enjoy – cheers!
~ Luke 👊
——————— #SubaruONLY Contact Info ———————
🔹 Website – www.SubaruOnly.com
🔹 Email – SubaruOnlyShop@gmail.com
🔹 YouTube – https://www.youtube.com/c/SubaruONLY
🔹 Facebook – https://www.facebook.com/SubaruOnlyShop/
🔹 Instagram – https://instagram.com/p/Bk3xRghF5LN/
){kind=link}
so its a m20 but whats the tread pitch
Vems actually tested the flow to be equivalent to the odd pistons flows not too much not to little
(Edit: I love your vids! I’d prefer the cheaper route anyway cuz a 90$ for a special fitting hose and three way isn’t my forte)
Hey Luke thanks for the video. Also a hydrogeologist with Barr Engineering. I own a 2011 STI with an IAG stage 2 short block – I'm thinking I need to do this mod. I'll add you to LinkedIn!
Support the guy who originally brought us the product (dom acia)
Witch one is the one we should buy
Many thanks for posting this vid (among all your others ! ) . Just found out about this mod the other day and was dumbfounded by the cost. Thank you for measuring the plug size ! Wanted to make my own but could not find the size anywhere ! Is it possible to have you verify the pitch of the thread as well ?
He soooooo put that T fitting on wrong…
My questions are
Why is there a bung to begin with? A rather large one at that. And why hasn't Subaru figured this out?
This guy was works with Dom..
MATE SOME EJ20T SUBARU COME 'STOCK' WITH THIS DONE!
@subaruONLY where can i buy this?
they are both overpriced to a point which makes me angry!!
Another failure point… waste of money garbage. Whoever started this fad is stupid. Coolant is a closed system under pressure. Stagnant doesn't exhist in a pressurized system.
Where does the T connect to after that? Lol
Coolant reroute kits are available from other vendors for the Miata as well. My issue with these reroute kits is that they make claims of cooling the number 4 cylinder, but they don’t have any tests to support it. Yes the design in theory looks better, and for built performance race motors, sure go for it. I did the reroute on my built motor, but for the vast majority of Miata owners, this isn’t necessary. Do any of the Subaru vendors have any testing to show the benefits? I couldn’t find any.
Was getting ready to do a timing belt on my wifes wrx soon. Thanks to you i will now be adding this to the job. Awesome! Thanks!
Very glad I found your channel, thanks for all the help!
Nice kits. I'm definitely going to do this mod, when I build a spare EJ207 for my V5 RA.
Cool video (No pun). Subscribed.
Never heard of this mod till now and it is absolutely genius. I think that will make a nice little weekend project
Have a ea81 in a 83 gl wagon .hadnt seen any older vids ..come on now …
Thanks a lot for the review and the video.
Just to be helpful about the design criteria, having too much flow is a bad thing for this kit. My fitting is custom and not off the shelf because I spent a lot of time testing different internal diameters. Too large of a diameter causes low heater core flow (even more than these kits already produce), reduced balance and flow to the other cylinders and the oil cooler.
The hose is a very high temp and expensive silicone hose with a tighter allowable bend radius than other hose on the market. Made in the USA.
The hose clamps are all very high grade stainless clamps. Made in the USA.
The worm clamps are stainless, non-perforated, SS, embossed, rolled edge clamps. Made in the USA.
The fitting is custom made, anodized, 6061 aluminum. Made in the USA.
The T is Stainless, but made in Poland. (The VEMS T is just coated mild steel).
The kit was made to create a good balance in the cooling system and the internal diameter is what dictates that. A Y would be too much flow as well.
Lastly, at the very end, you showed the hose connected to the T incorrectly. On your setup, you should be cutting the hose down to the size shown on the instructions.
Thanks again!
I put this in the reply to T3h_Clap but…
I also don't think a "y" fitting would work well either.
I think it's made to not only let coolant enter the heater hose flow, but the coolant in the heater hose will inherently pull the cyl 4 coolant into the fluid stream… Having the straight part of the T fitting being the heater flow would allow that to happen whereas a Y fitting might allow some coolant flow from the heater to try to enter the cooling mod hose.
Beatrush I believe is from Japan made by Laile.